4 comments:

A few things to add:-For any problem, you can use any amount of Joules you want, as long as it's logical, so we could've used different numbers for the elevator problem.-When you said 10 meters is the elevator height, I think you meant 10 meters is height of each floor.

Integer statement: I'm pretty sure it's exactly what you've put; Force * Displacement = WorkHowever, I think it's a little different when it's with the bar charts. If you have $20 in your pocket and $10 in your wallet, and you put $5 in your wallet from your pocket, you would say: 20+10=15+15 to show that no money has been spent or earned.